/****************************************************************************** * hypervisor.h * * Linux-specific hypervisor handling. * * Copyright (c) 2002-2004, K A Fraser * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License version 2 * as published by the Free Software Foundation; or, when distributed * separately from the Linux kernel or incorporated into other * software packages, subject to the following license: * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this source file (the "Software"), to deal in the Software without * restriction, including without limitation the rights to use, copy, modify, * merge, publish, distribute, sublicense, and/or sell copies of the Software, * and to permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS * IN THE SOFTWARE. */ #ifndef _ASM_X86_XEN_HYPERVISOR_H #define _ASM_X86_XEN_HYPERVISOR_H extern struct shared_info *HYPERVISOR_shared_info; extern struct start_info *xen_start_info; #include static inline uint32_t xen_cpuid_base(void) { uint32_t base, eax, ebx, ecx, edx; char signature[13]; for (base = 0x40000000; base < 0x40010000; base += 0x100) { cpuid(base, &eax, &ebx, &ecx, &edx); *(uint32_t *)(signature + 0) = ebx; *(uint32_t *)(signature + 4) = ecx; *(uint32_t *)(signature + 8) = edx; signature[12] = 0; if (!strcmp("XenVMMXenVMM", signature) && ((eax - base) >= 2)) return base; } return 0; } #ifdef CONFIG_XEN extern bool xen_hvm_need_lapic(void); static inline bool xen_x2apic_para_available(void) { return xen_hvm_need_lapic(); } #else static inline bool xen_x2apic_para_available(void) { return (xen_cpuid_base() != 0); } #endif extern void xen_set_iopl_mask(unsigned mask); #endif /* _ASM_X86_XEN_HYPERVISOR_H */